Fixed wireless access channels in the 5 GHz band have been measured with eight-element uniform linear antenna arrays at both ends, thus providing an 8 8 configuration. The measurements were performed at three different locations in downtown Toronto. The application of the time reversal (TR) technique in a multiple-input-single-output (MISO) configuration can reduce the delay spread of the channel impulse response by a factor of 2-3, depending on the power allocation scheme.

Problem statement:The objective of this research was to evaluate the degree of soil contamination with arsenic and antimony in Baia Mare, a nonferrous mining and metallurgical center located in the North West region of Romania. The soil in the area is affected by the emissions of powders containing metals from metallurgical factories. Previous studies indicated the soil contamination with copper, zinc, cadmium and lead, but there is few data about the actual level of soil pollution with arsenic and antimony. Approach: The soil samples were collected from 2 districts of Baia Mare: Ferneziu, which is located in the proximity of a lead smelter and Săsar district which is located along the Săsar River in the preferential direction of the wind over a metallurgical factory producing lead. As reference was considered Dura area located in a less polluted hilly area, in the west part of the town. Samples of soil and plants from the residential area of Ferneziu, Săsar and Dura districts were collected. The arsenic determination was carried out by inductively coupled plasma atomic emission spectrometry and the antimony determination by inductively coupled plasma mass spectrometry. Results: In Ferneziu area, the concentration of arsenic in soil ranged between 0.25 and 255 mg kg −1 . In Săsar district the arsenic concentration in the soil ranged between 5.5 and 295 mg kg −1 . Regarding antimony, in Ferneziu area the concentration ranged between 5.3 and 40.6 mg kg −1 ; while in Săsar, antimony soils concentrations vary in the range: 0.9-18.4. Arsenic and antimony concentrations in plants were low for almost of the samples, both in Ferneziu and Săsar area indicating a low mobility of these elements in the studied soils. Conclusion: This study indicated the soil pollution with arsenic both in Ferneziu district and in Săsar district. The soil pollution with antimony was found especially in Ferneziu district.

Background: The use of digital tools to measure physiological and behavioural variables of potential relevance to mental health is a growing field sitting at the intersection between computer science, engineering and clinical science. We aim to summarise the literature on remote measuring technologies, mapping methodological challenges and threats to reproducibility, and to identify leading digital signals for depression. Methods: Medical and computer science databases were searched between January 2007 to November 2019. Published studies linking depression and objective behavioural data obtained from smartphone and wearable device sensors in adults with unipolar depression and healthy subjects were included (PROSPERO registration: 2019 CRD42019159929). A descriptive approach was taken to synthesise study methodologies. Results We included 52 studies and found threats to reproducibility and transparency arising from failure to provide comprehensive descriptions of recruitment strategies, sample information, feature construction and the determination and handling of missing data. The literature is characterised by small sample sizes, short follow-up duration and great variability in quality of reporting, limiting the interpretability of pooled results. Bivariate analyses show some consistency in statistically significant associations between depression and digital features from sleep, physical activity, location, and phone use data. Regression and classification machine learning models found predictive value of aggregated features. Interpretation: Recommendations are put forward to improve aspects of generalisability and reproducibility, such as wider diversity of samples, thorough reporting methodology and the potential for reporting bias in studies with numerous features. Funding: National Institute for Health Research (NIHR) Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King's College London.

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